编译httpd 2.4.29 报错
{

AH10034: The mpm module (prefork.c) is not supported by mod_http2. 
The mpm determines how things are processed in your server. HTTP/2 
has more demands in this regard and the currently selected mpm will just not do. 
This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.



在编译时候指定 --with-mpm=event  

在2.4.29 版本中已经不支持 prefork 模式 ，建议使用 event模式 


}